Piston ring tool



G. MESAROS PISTON RING TOOL Nov. 2, 1948.

2 Sheets-Sheet, 1

Filed Oct. 15, 1945 Iuz'enlor I earyefleaaros Nov} 2, 1948 G. MESAROS 2,452,857

PISTON RING TOOL Filed 001. 15, 1945 2 Sheets-Sheet 2 A ttorney Patented Nov. 2, 1948 PISTON RINMG TGQL GeQi'seMesa hi der J- weim ie iiq Qc ber 13, iieme- 62Z1 2 claims.

This invention relates generally to piston ring tools of a type generally similar to that constituting the subject matter of United States Patent No. 1,511,761, issued on October 14, 1924, on which the present device constitutes an improvement, the same being for the invention set forth in the forfeited application Serial No. 412,343, filed September 25,1941.

The primary Object of the present invention-is toprovide, in a manner as hereinafter set forth, a piston ring topl of the aforementioned character comprising adjustable means of a novel construction and arrangement for controlling or regulating the operation of the handle actuated jaws .wliich grip andspread orexpand the piston ring.

Other objects of the invention are to provide and adjustable piston ring tool of the character described which will be comparatively simple in construction, strong, durable, highly efficient and reliable in use, compact, light in weight and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawing wherein like characters of reference designate correspondin parts throughout the several views, and wherein:

Fig. 1 is a top plan view of an adjustable piston ring tool constructed in accordance with the present invention showing the device in use.

Fig. 2 is a view in side elevation thereof.

Fig. 3 is a view in vertical longitudinal section through the forward portion of the tool.

Fig. 4 is a bottom plan view of the forward portion of the device.

Fig. 5 is a cross-sectional View taken substantially on line 55 of Fig. 2.

Referring now to the drawing in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a pair of handles I of suitable metal. A pivot 2 connects one end portion of the handles I. Projecting at an acute angle from the pivoted end portions of the handles I are arms 3 which are integral with said handles.

Rotatably mounted beneath the outer end portions of the arms 3 are lugs 4 of suitable metal. The lugs 4 comprise reduced stems 5 which are journaled in apertures which are provided therefor in the arms 3, said stems projecting above said arms.

Also journaled on the pivot 2 is a pair of metallic ring spreading legs 6. The free end portions of the legs 6 are formed to provide stationary jaws J. A coil spring 8fiyieldingly resists spreadingof the-legs li.

Pivotally mounted on the free end portionsrof the .legs 6 are jaws 9 which are cooperablewith the jaws '1. books II which are pivotally connected to the pivoted end of :the jaws 9 for swinging said jaws Rods I9 terminate, at oneend, in

ends .of thecoll springs I2 are detachablycom nectedto the pins 5 abovethe arms 3. Thusithe coil springs I2 constitute means for releasably securing the pins 5 in the apertures or openings which are provided therefo in the arms 3. Tubular covers or shields I3 protect the coil springs I2.

Adjacent the pivot 2, one of the handles l has formed longitudinally therein a slot I4. Adjustable in the slot I4 is a stop I5 which is engageable by the other handle I for positively limiting the spreading of the legs 6 and consequently the expansion of the ring.

In Figs. 1 and 2 of the drawing, the upper portion of a conventional piston is indicated at I6. The piston I6 has mounted thereon a plurality of the usual split rings II.

It is thought that the operation of the device will be readily apparent from a consideration of the foregoing. Briefly, the spring 8 normally retains the legs 6 in closed position and the springs I2 normally retain the jaws 9 and the handles I in open position. The end portions of the piston ring to be expanded are engaged between the jaws I and 9 and the handles I are then swung toward each other. Thus, through the medium of the arms 3 and the rods II], the jaws 9 are swung toward the jaws I against the tension of the springs I2. When the end portions of the split piston ring are gripped between the pairs of jaws I and 9 the closing movement of the latter is, of course, arrested. Then, as swinging movement of the handles I toward each other continues the rods IIl open the legs 6 against the tension of the spring 8 for expanding the piston ring. When the desired degree of expansion has been reached the stop I5 which, as hereinbefore stated, is adjustable, prevents further closing of the handles I. By adjusting the threaded rods I I] in the lugs 4 the pivoted jaws 9 may be expeditiously and accurately adjusted as desired relative to the sta tionary jaws I.

It is believed that the many advantages of an adjustable piston ring tool constructed in accordance with the present invention will be readily understood and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:

1. A piston ring tool of the character described comprising a pair of handles pivotally connected at one end, arms projecting from the pivoted end portions of said handles, legs pivotally mounted on the pivoted end portions of the handles, coacting pivoted and stationary jaws on the free end portions of said legs, lugs rotatably mounted on the arms by means passing at right angles through the arms, rods having one end operatively connected to the pivoted jaws and their other end portions threadedly engaging through the lugs at right angles to the axes thereof at one side of said arms for actuation by the arms and for Varying the length of said rods so as to adjust the pivoted jaws with reference to the stationary jaws for varying the width of the jaw openings, and springs on the other side of said arms connected to the lugs and to the pivoted jaws for opening said pivoted jaws and for securing the lugs to the arms.

2. A piston ring tool of the character described comprising a pair of handles pivotall connected together at their inner end, arms projecting from the pivoted end portions of said handles, legs pivotally mounted on the pivoted end portions of the handles, co-acting pivoted and stationary 4 jaws at the free end portions of said legs, lugs extending through apertures in said arms rotatably mounting the lugs thereto, rods having their outer ends operatively connected to the pivoted jaws respectively and the other 1 end portionsthreadedly engaging through said lugs for varying the length of said rods to thereby adjust the pivoted jaws with reference to the stationary jaws for varying the width of the jaw openings, one of said handles having a longitudinally extending slot and a stop element adapted to be engaged by the other handle for limiting the inward movement thereof, said stop element being adjustable longitudinally of said slot for varying the spreading apart of said legs and the co-acting pivoted and stationary jaws at the free ends thereof, and springs connected with said lugs and to the pivoted jaws for opening said jaws and for securing the lugs to the arms.

GEORGE MESAROS.

REFERENCES CITED The following references are of record in the file Of this patent:

UNITED STATES PATENTS Number Name Date 1,345,035 Swickard June 29, 1920 1,427,298 Jones Aug. 29, 1922 1,511,761 Hutsell Oct. 14, 1924 FOREIGN PATENTS Number Country Date 289,867 Italy Oct. 30, 1931 496,031 Great Britain nnnn Nov. 23, 1938 

